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Magnesia Cupels

  1. ABOUT US
  2. Magnesia Cupels

SALIENT FEATURES

  • All Cupels Absorb Litherage Approximately70% Of Their Weight
  • Rapid Absorption Of Litharge, Cracking And Spit Free
  • No Spitting Of Lead
  • Beads Can Easily Be Removed
  • Consistently Low Loss
  • Robust Mechanical Strength
  • Does Not Gets Affects By Atmospheric Changes
  • Perfect Quality And Performance
  • Reduced Tendency To Freeze
  • Regular Testing At Our In House Lab

Cupels Drawing

Magnesia Cupels are made from a unique blend of Magnesium Oxide and special fluxing ingredients. Magnesia Cupels are sometimes incorrectly referred to as "magnesite" Cupellation is the last and most important step in the fire assay process,hence the quality of cupel is extremely important. During cupellation, the lead is oxidized to litharge (PbO), most of which is absorbed by the cupel. precious metals like Gold, silver, platinum and other precious metals form a bead in the cupel. The bead is subsequently used to determine its precious metal content . Cupels are of various types like magnesia MgO Cupels, bone ash Cupels, Portland cement Cupels etc... Generally cupellation furnace temperatures in gold and silver assays is 900-1000°C, but varies with technique, air flow volume and cupel material used.

Magnesia Cupels Dimensions Data in (‘mm’)

Size
Outer
Dia
Dia
Of Cup
Dia
Of Base
Height
Of Cupel
Depth
Of Cup
Height
Of Ridge
Breadth
Of Ridge
Average
Weight
(Approx.)
Pieces Per
Carton
Gross
Weight
(Approx.)
 
D
D1
D2
H
H1
H2
B/R
(Gm's)
(Kg's)
1
22.0
17.5
16.5
18.4
4.3
5.0
2.30
13.0
1440
19.5
2X
24.0
19.0
19.4
16.3
7.0
5.0
2.50
13.0
1296
17.5
3
26.3
21.3
20.2
17.0
7.0
5.0
2.50
16.5
1080
18.6
4
30.4
25.4
19.9
18.2
7.5
5.0
2.50
20.0
819
17.2
4A
27.0
24.0
20.0
22.0
6.0
7.5
1.50
22.0
900
20.5
PM
27.0
23.4
26.8
24.0
8.0
...
1.80
27.5
720
20.5
5
31.6
26.2
21.9
19.7
7.0
5.0
2.70
24.5
728
18.5
6
36.3
26.4
26.1
21.2
8.5
8.0
4.95
37.5
462
18.0
6A
40.0
32.7
30.0
25.4
12.3
6.0
3.65
47.5
300
15.0
6C
40.2
30.3
30.5
27.5
8.0
9.0
4.95
62.0
300
19.3
6D
38.8
32.8
30.0
30.0
7.8
9.5
3.00
61.5
300
19.2
7
39.5
31.2
29.0
22.0
11.0
6.5
4.15
44.5
300
14.0
7A
39.7
31.2
30.0
28.5
11.8
9.0
4.25
59.0
300
18.5
7A
39.7
31.2
30.0
28.5
11.8
9.0
4.25
59.0
420
25.9
7AL
39.7
31.2
30.0
28.5
12.3
6.0
4.25
55.0
420
24.3
7AS
40.0
31.0
30.0
34.0
12.0
14.0
4.50
72.0
300
22.1
7B
39.7
31.2
30.0
32.0
11.8
12.5
4.25
67.5
300
21.1
7C
40.0
33.0
30.0
30.0
9.5
4.0
3.50
59.0
300
18.4
7F
36.0
29.0
30.0
39.0
10.0
11.5
3.50
73.5
250
19.1
7X
39.7
31.2
30.0
35.0
11.8
15.5
4.25
76.0
300
23.6
SA
40.0
30.2
30.0
25.4
8.7
6.0
4.90
54.5
300
17.1
8
44.3
34.2
34.6
27.1
8.5
9.0
5.05
73.0
240
18.2
8A
45.3
38.0
36.9
35.0
12.5
13.0
3.65
100.0
200
20.8
8AM
45.3
34.0
36.9
35.0
11.5
13.0
5.65
105.0
200
21.8
8B
45.3
34.0
36.9
35.0
14.5
13.0
5.65
101.0
200
20.9
8C
44.8
34.0
35.5
31.0
12.5
11.0
5.40
90.0
240
22.3
8D
45.3
34.2
34.6
27.1
12.5
9.0
5.05
71.0
300
22.2
8F
44.5
34.5
35.0
38.0
13.0
10.5
5.00
100.5
200
20.9
8S
44.0
38.0
34.0
40.0
14.0
13.0
3.00
107.0
180
20.0
8Y
42.0
38.0
42.0
33.0
9.0
...
2.00
100.0
200
20.2
9
51.0
40.0
42.1
29.0
10.5
9.0
5.50
110.0
192
21.7
9C
51.0
42.0
43.0
33.5
12.0
5.5
4.50
126.0
160
20.9
9F
51.0
42.0
41.0
40.0
14.0
11.0
4.50
140.0
128
18.4
10
60.0
52.6
49.7
30.2
11.5
11.0
3.70
150.0
140
21.5
11
56.8
47.8
48.8
44.0
14.8
10.0
4.50
200.0
112
22.7
12
80.2
57.5
62.5
47.0
16.5
11.0
11.35
445.0
45
20.6
14
110.0
80.0
88.0
70.0
24.0
14.0
15.00
1190.0
16
19.7
15
150.0
120.0
128.0
130.0
40.0
25.0
15.00
4725.0
4
20.0
PC
254.0
184.7
203.2
161.6
55.4
32.33
34.65
16000.0
1
16.6

 


* Approximate